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** Q 1237434382. ** A variable plane `x/a+y/b+z/c=1` at a unit distance from origin cuts the coordinate axes at `A, B` and `C`. Centroid `(x, y, z)` satisfies the equation `1/x^2+1/y^2+1/z^2=K` . The value of `K` is

**JEE 1983 **